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basic_drawing.c
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basic_drawing.c
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#include <stdlib.h>
#include <stdio.h>
#include <xcb/xcb.h>
int main()
{
/* geometric objects */
xcb_point_t points[] = {
{10, 10},
{10, 20},
{20, 10},
{20, 20}
};
xcb_point_t polyline[] = {
{50, 10},
{5, 20}, /* rest of points are relative */
{25, -20},
{10, 10}
};
xcb_segment_t segments[] = {
{100, 10, 140, 30},
{110, 25, 130, 60}
};
xcb_rectangle_t rectangles[] = {
{10, 50, 40, 20},
{80, 50, 10, 40}
};
xcb_arc_t arcs[] = {
{10, 100, 60, 40, 0, 90 << 6},
{90, 100, 55, 40, 0, 270 << 6}
};
/* Open the connection to the X server */
xcb_connection_t *connection = xcb_connect(NULL, NULL);
/* Get the first screen */
xcb_screen_t *screen = xcb_setup_roots_iterator(xcb_get_setup(connection)).data;
/* Create black (foreground) graphic context */
xcb_drawable_t window = screen->root;
xcb_gcontext_t foreground = xcb_generate_id(connection);
uint32_t mask = XCB_GC_FOREGROUND | XCB_GC_GRAPHICS_EXPOSURES;
uint32_t values[2] = { screen->black_pixel, 0 };
xcb_create_gc(connection, foreground, window, mask, values);
/* Create a window */
window = xcb_generate_id(connection);
mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
values[0] = screen->white_pixel;
values[1] = XCB_EVENT_MASK_EXPOSURE;
xcb_create_window(connection, /* connection */
XCB_COPY_FROM_PARENT, /* depth */
window, /* window Id */
screen->root, /* parent window */
0, 0, /* x, y */
150, 150, /* width, height */
10, /* border_width */
XCB_WINDOW_CLASS_INPUT_OUTPUT, /* class */
screen->root_visual, /* visual */
mask, values); /* masks */
/* Map the window on the screen and flush */
xcb_map_window(connection, window);
xcb_flush(connection);
/* draw primitives */
xcb_generic_event_t *event;
while ((event = xcb_wait_for_event(connection))) {
switch (event->response_type & ~0x80) {
case XCB_EXPOSE:
/* We draw the points */
xcb_poly_point(connection, XCB_COORD_MODE_ORIGIN, window, foreground, 4, points);
/* We draw the polygonal line */
xcb_poly_line(connection, XCB_COORD_MODE_PREVIOUS, window, foreground, 4, polyline);
/* We draw the segements */
xcb_poly_segment(connection, window, foreground, 2, segments);
/* draw the rectangles */
xcb_poly_rectangle(connection, window, foreground, 2, rectangles);
/* draw the arcs */
xcb_poly_arc(connection, window, foreground, 2, arcs);
/* flush the request */
xcb_flush(connection);
break;
default:
/* Unknown event type, ignore it */
break;
}
free(event);
}
return 0;
}